GENERAL HISTOLOGY

Detailed explanation-1: -No distinct excretory organs – nitrogenous waste is removed from the water vascular system via diffusion through tube feet or with digestive waste.

Detailed explanation-2: -Echinoderms do not have primary excretion organs, but instead expel their nitrogenous waste through their respiratory system in the form of ammonia. > However, the anus is present in most echinoderms and is often used to jettison waste.

Detailed explanation-3: -Echinoderms have a simple excretory system with no kidneys and use diffusion to rid their bodies of nitrogenous waste which is mainly ammonia gas.

Detailed explanation-4: -Excretion in echinoderms is by simple diffusion of metabolic wastes (ammonia) across thin permeable regions of the body wall. A variety of gas exchange structures, including the tube feet, is found in various echinoderms.

Detailed explanation-5: -In general, echinoderms typically respire by simple diffusion, using gills or specialized projections, like tube feet or pockets, to circulate water and oxygen through their bodies. Many echinoderms also use a simple hemal system, a series of pockets and tubes that serves almost like a net of veins and arteries.